home *** CD-ROM | disk | FTP | other *** search
- /*
- Copyright (C) 1996-1997 Id Software, Inc.
-
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation; either version 2
- of the License, or (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-
- See the GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
- */
- // r_sky.c
-
- #include "quakedef.h"
- #include "r_local.h"
- #include "d_local.h"
-
-
- int iskyspeed = 8;
- int iskyspeed2 = 2;
- float skyspeed, skyspeed2;
-
- float skytime;
-
- byte *r_skysource;
-
- int r_skymade;
- int r_skydirect; // not used?
-
-
- // TODO: clean up these routines
-
- byte bottomsky[128*131];
- byte bottommask[128*131];
- byte newsky[128*256]; // newsky and topsky both pack in here, 128 bytes
- // of newsky on the left of each scan, 128 bytes
- // of topsky on the right, because the low-level
- // drawers need 256-byte scan widths
-
-
- /*
- =============
- R_InitSky
-
- A sky texture is 256*128, with the right side being a masked overlay
- ==============
- */
- void R_InitSky (texture_t *mt)
- {
- int i, j;
- byte *src;
-
- src = (byte *)mt + mt->offsets[0];
-
- for (i=0 ; i<128 ; i++)
- {
- for (j=0 ; j<128 ; j++)
- {
- newsky[(i*256) + j + 128] = src[i*256 + j + 128];
- }
- }
-
- for (i=0 ; i<128 ; i++)
- {
- for (j=0 ; j<131 ; j++)
- {
- if (src[i*256 + (j & 0x7F)])
- {
- bottomsky[(i*131) + j] = src[i*256 + (j & 0x7F)];
- bottommask[(i*131) + j] = 0;
- }
- else
- {
- bottomsky[(i*131) + j] = 0;
- bottommask[(i*131) + j] = 0xff;
- }
- }
- }
-
- r_skysource = newsky;
- }
-
-
- /*
- =================
- R_MakeSky
- =================
- */
- void R_MakeSky (void)
- {
- int x, y;
- int ofs, baseofs;
- int xshift, yshift;
- unsigned *pnewsky;
- static int xlast = -1, ylast = -1;
-
- xshift = skytime*skyspeed;
- yshift = skytime*skyspeed;
-
- if ((xshift == xlast) && (yshift == ylast))
- return;
-
- xlast = xshift;
- ylast = yshift;
-
- pnewsky = (unsigned *)&newsky[0];
-
- for (y=0 ; y<SKYSIZE ; y++)
- {
- baseofs = ((y+yshift) & SKYMASK) * 131;
-
- // FIXME: clean this up
- #if UNALIGNED_OK
-
- for (x=0 ; x<SKYSIZE ; x += 4)
- {
- ofs = baseofs + ((x+xshift) & SKYMASK);
-
- // PORT: unaligned dword access to bottommask and bottomsky
-
- *pnewsky = (*(pnewsky + (128 / sizeof (unsigned))) &
- *(unsigned *)&bottommask[ofs]) |
- *(unsigned *)&bottomsky[ofs];
- pnewsky++;
- }
-
- #else
-
- for (x=0 ; x<SKYSIZE ; x++)
- {
- ofs = baseofs + ((x+xshift) & SKYMASK);
-
- *(byte *)pnewsky = (*((byte *)pnewsky + 128) &
- *(byte *)&bottommask[ofs]) |
- *(byte *)&bottomsky[ofs];
- pnewsky = (unsigned *)((byte *)pnewsky + 1);
- }
-
- #endif
-
- pnewsky += 128 / sizeof (unsigned);
- }
-
- r_skymade = 1;
- }
-
-
- /*
- =================
- R_GenSkyTile
- =================
- */
- void R_GenSkyTile (void *pdest)
- {
- int x, y;
- int ofs, baseofs;
- int xshift, yshift;
- unsigned *pnewsky;
- unsigned *pd;
-
- xshift = skytime*skyspeed;
- yshift = skytime*skyspeed;
-
- pnewsky = (unsigned *)&newsky[0];
- pd = (unsigned *)pdest;
-
- for (y=0 ; y<SKYSIZE ; y++)
- {
- baseofs = ((y+yshift) & SKYMASK) * 131;
-
- // FIXME: clean this up
- #if UNALIGNED_OK
-
- for (x=0 ; x<SKYSIZE ; x += 4)
- {
- ofs = baseofs + ((x+xshift) & SKYMASK);
-
- // PORT: unaligned dword access to bottommask and bottomsky
-
- *pd = (*(pnewsky + (128 / sizeof (unsigned))) &
- *(unsigned *)&bottommask[ofs]) |
- *(unsigned *)&bottomsky[ofs];
- pnewsky++;
- pd++;
- }
-
- #else
-
- for (x=0 ; x<SKYSIZE ; x++)
- {
- ofs = baseofs + ((x+xshift) & SKYMASK);
-
- *(byte *)pd = (*((byte *)pnewsky + 128) &
- *(byte *)&bottommask[ofs]) |
- *(byte *)&bottomsky[ofs];
- pnewsky = (unsigned *)((byte *)pnewsky + 1);
- pd = (unsigned *)((byte *)pd + 1);
- }
-
- #endif
-
- pnewsky += 128 / sizeof (unsigned);
- }
- }
-
-
- /*
- =================
- R_GenSkyTile16
- =================
- */
- void R_GenSkyTile16 (void *pdest)
- {
- int x, y;
- int ofs, baseofs;
- int xshift, yshift;
- byte *pnewsky;
- unsigned short *pd;
-
- xshift = skytime * skyspeed;
- yshift = skytime * skyspeed;
-
- pnewsky = (byte *)&newsky[0];
- pd = (unsigned short *)pdest;
-
- for (y=0 ; y<SKYSIZE ; y++)
- {
- baseofs = ((y+yshift) & SKYMASK) * 131;
-
- // FIXME: clean this up
- // FIXME: do faster unaligned version?
- for (x=0 ; x<SKYSIZE ; x++)
- {
- ofs = baseofs + ((x+xshift) & SKYMASK);
-
- *pd = d_8to16table[(*(pnewsky + 128) &
- *(byte *)&bottommask[ofs]) |
- *(byte *)&bottomsky[ofs]];
- pnewsky++;
- pd++;
- }
-
- pnewsky += TILE_SIZE;
- }
- }
-
-
- /*
- =============
- R_SetSkyFrame
- ==============
- */
- void R_SetSkyFrame (void)
- {
- int g, s1, s2;
- float temp;
-
- skyspeed = iskyspeed;
- skyspeed2 = iskyspeed2;
-
- g = GreatestCommonDivisor (iskyspeed, iskyspeed2);
- s1 = iskyspeed / g;
- s2 = iskyspeed2 / g;
- temp = SKYSIZE * s1 * s2;
-
- skytime = cl.time - ((int)(cl.time / temp) * temp);
-
-
- r_skymade = 0;
- }
-
-
-